def print_shopping_list(items):
    width = 30
    print('=' * width)
    print('{:<20s}{:>10s}'.format('项目', '价格'))
    print('-' * width)
    for item in items:
        name, price = item
        print('{:<20s}{:>10.2f}'.format(name, price))
    print('=' * width)
items = [('苹果', 6.00), ('桔子', 3.20), ('香蕉', 2.50), ('葡萄', 14.80), ('红提', 15.00), ('西瓜', 1.50)]
print_shopping_list(items)